bigdecimal & bigmath

backport #3271, #3211, #3221

* jruby-1_7: (27 commits)
  meh,  use the included hook instead to get a simple test skip on --1.8 mode
  some more --1.8 skip fixes (4 less future surprises)
  test skip 1.8.7 test-unit compatibility
  adding a skip-ed test-case for callin abstract (Ruby impl) method in constructor
  less intermediate strings on proxy class name generation
  some notes on Java proxy invocation handler class hierarchy + un-used import
  make generated Java proxy class fields final
  include_package spec no longer pending
  [ji] include package should work with a package instance (just like import)
  java_alias should not fail when no include_package called previously
  add a possible TODO note for proc-to-iface dispatch
  Fix VERSION so jruby-jars builds find the right jars.
  Update joda time to 2.8.2.
  Fixes #3286. Encoding of symbol literals does not respect the encoding of the source file (1.9 edition)
  Move psych to 1.9 lib so only 1.9 and 2.0 modes can see it.
  backport #3271, #3211, #3221
  [ji] improved more-specific type matching when matching Java methods
  another (pending) Java 8 JI spec - hitting the wall with Predicate#test(arg1)
  Exclude odd DateTime roundtrip failure in Psych.
  Update psych+tests to 2.0.15.
  ...

Conflicts:
	.travis.yml
	VERSION
	core/pom.xml
	core/src/main/java/org/jruby/ext/bigdecimal/RubyBigDecimal.java
	core/src/main/java/org/jruby/ext/psych/PsychLibrary.java
	core/src/main/java/org/jruby/ext/psych/PsychParser.java
	core/src/main/java/org/jruby/ext/psych/PsychToRuby.java
	core/src/main/java/org/jruby/parser/ParserSupport.java
	core/src/main/java/org/jruby/parser/Ruby19Parser.java
	core/src/main/java/org/jruby/parser/Ruby19Parser.y
	docs/man/pom.xml
	docs/pom.xml
	ext/pom.xml
	ext/readline/pom.xml
	ext/ripper/pom.xml
	lib/pom.rb
	lib/pom.xml
	lib/ruby/1.8/bigdecimal/math.rb
	lib/ruby/1.9/bigdecimal/math.rb
	lib/ruby/1.9/psych.rb
	lib/ruby/1.9/psych/coder.rb
	lib/ruby/1.9/psych/core_ext.rb
	lib/ruby/1.9/psych/deprecated.rb
	lib/ruby/1.9/psych/handler.rb
	lib/ruby/1.9/psych/handlers/document_stream.rb
	lib/ruby/1.9/psych/handlers/recorder.rb
	lib/ruby/1.9/psych/json/ruby_events.rb
	lib/ruby/1.9/psych/json/stream.rb
	lib/ruby/1.9/psych/json/tree_builder.rb
	lib/ruby/1.9/psych/json/yaml_events.rb
	lib/ruby/1.9/psych/nodes.rb
	lib/ruby/1.9/psych/nodes/alias.rb
	lib/ruby/1.9/psych/nodes/document.rb
	lib/ruby/1.9/psych/nodes/mapping.rb
	lib/ruby/1.9/psych/nodes/node.rb
	lib/ruby/1.9/psych/nodes/scalar.rb
	lib/ruby/1.9/psych/nodes/sequence.rb
	lib/ruby/1.9/psych/nodes/stream.rb
	lib/ruby/1.9/psych/omap.rb
	lib/ruby/1.9/psych/parser.rb
	lib/ruby/1.9/psych/scalar_scanner.rb
	lib/ruby/1.9/psych/set.rb
	lib/ruby/1.9/psych/stream.rb
	lib/ruby/1.9/psych/syntax_error.rb
	lib/ruby/1.9/psych/tree_builder.rb
	lib/ruby/1.9/psych/visitors.rb
	lib/ruby/1.9/psych/visitors/depth_first.rb
	lib/ruby/1.9/psych/visitors/emitter.rb
	lib/ruby/1.9/psych/visitors/json_tree.rb
	lib/ruby/1.9/psych/visitors/to_ruby.rb
	lib/ruby/1.9/psych/visitors/visitor.rb
	lib/ruby/1.9/psych/visitors/yaml_tree.rb
	lib/ruby/1.9/psych/y.rb
	lib/ruby/2.0/bigdecimal/math.rb
	maven/jruby-complete/pom.xml
	maven/jruby-dist/pom.xml
	maven/jruby-jars/pom.xml
	maven/jruby-noasm/pom.xml
	maven/jruby-rake-plugin/pom.xml
	maven/jruby-stdlib/pom.xml
	maven/jruby/pom.xml
	maven/pom.xml
	pom.xml
	spec/java_integration/packages/access_spec.rb
	test/externals/ruby1.9/psych/helper.rb
	test/externals/ruby1.9/psych/test_alias_and_anchor.rb
	test/externals/ruby1.9/psych/test_array.rb
	test/externals/ruby1.9/psych/test_boolean.rb
	test/externals/ruby1.9/psych/test_class.rb
	test/externals/ruby1.9/psych/test_coder.rb
	test/externals/ruby1.9/psych/test_date_time.rb
	test/externals/ruby1.9/psych/test_deprecated.rb
	test/externals/ruby1.9/psych/test_document.rb
	test/externals/ruby1.9/psych/test_emitter.rb
	test/externals/ruby1.9/psych/test_encoding.rb
	test/externals/ruby1.9/psych/test_exception.rb
	test/externals/ruby1.9/psych/test_hash.rb
	test/externals/ruby1.9/psych/test_json_tree.rb
	test/externals/ruby1.9/psych/test_merge_keys.rb
	test/externals/ruby1.9/psych/test_nil.rb
	test/externals/ruby1.9/psych/test_null.rb
	test/externals/ruby1.9/psych/test_numeric.rb
	test/externals/ruby1.9/psych/test_object.rb
	test/externals/ruby1.9/psych/test_object_references.rb
	test/externals/ruby1.9/psych/test_omap.rb
	test/externals/ruby1.9/psych/test_parser.rb
	test/externals/ruby1.9/psych/test_psych.rb
	test/externals/ruby1.9/psych/test_scalar.rb
	test/externals/ruby1.9/psych/test_scalar_scanner.rb
	test/externals/ruby1.9/psych/test_serialize_subclasses.rb
	test/externals/ruby1.9/psych/test_set.rb
	test/externals/ruby1.9/psych/test_stream.rb
	test/externals/ruby1.9/psych/test_string.rb
	test/externals/ruby1.9/psych/test_struct.rb
	test/externals/ruby1.9/psych/test_symbol.rb
	test/externals/ruby1.9/psych/test_tainted.rb
	test/externals/ruby1.9/psych/test_to_yaml_properties.rb
	test/externals/ruby1.9/psych/test_tree_builder.rb
	test/externals/ruby1.9/psych/test_yaml.rb
	test/externals/ruby1.9/psych/test_yamldbm.rb
	test/externals/ruby1.9/psych/test_yamlstore.rb
	test/externals/ruby1.9/psych/visitors/test_to_ruby.rb
	test/externals/ruby1.9/psych/visitors/test_yaml_tree.rb
	test/pom.xml
	test/test_command_line_switches.rb
	test/test_helper.rb
	test/test_higher_javasupport.rb
	test/test_load_gem_extensions.rb
	test/test_zlib.rb